what is the wavelength of the matter wave associated with an electron in the n=11 electronic orbit in the hydrogen atom? (report your answer in nm)

the de Broglie wavelength of the baseball is approximately 1.05 x 10^-34 meters.

The de Broglie wavelength of an object is given by the equation λ = h/mv, where h is Planck's constant (6.626 x 10^-34 J s), m is the mass of the object, and v is its velocity. Plugging in the given values for the baseball, we get:
λ = (6.626 x 10^-34 J s)/(211 g x 0.0310 m/s)
λ = 9.74 x 10^-35 m
Therefore, the de Broglie wavelength of the baseball is approximately 9.74 x 10^-35 meters.
Hi! To calculate the de Broglie wavelength of a 211 g baseball moving at 31.0 m/s, you'll need to use the de Broglie wavelength formula:
λ = h / (mv)
where λ represents the de Broglie wavelength, h is the Planck's constant (6.626 x 10^-34 Js), m is the mass of the object (211 g converted to kg), and v is its velocity (31.0 m/s).
First, convert the mass to kg: 211 g * (1 kg / 1000 g) = 0.211 kg
Now, plug the values into the formula:
λ = (6.626 x 10^-34 Js) / (0.211 kg * 31.0 m/s)
λ ≈ 1.05 x 10^-34 m

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The mass of the box is 11.8 kg.

We can use Newton's second law, which states that the net force on an object is equal to its mass times its acceleration:

F_net = ma

In this case, the fisherman applies a horizontal force to the box, and the box accelerates in the same direction. Since there is no friction, the net force on the box is equal to the force applied by the fisherman:

F_net = 42.5 N

The acceleration of the box is given as 3.60 [tex]m/s^2[/tex]. We can now solve for the mass of the box by rearranging the formula:

m = F_net / a

Substituting the given values, we get:

m = 42.5 N / 3.60[tex]m/s^2[/tex]

m = 11.8 kg

Therefore, the mass of the box is 11.8 kg.

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The correct answer is option (b) increase the potential difference between the two ends of the wire.

To increase the current density, J in a wire of length l and diameter D, you would need to increase the potential difference between the two ends of the wire, as current density is directly proportional to potential difference. The equation for current density is J = I/A, where I is the current flowing through the wire and A is the cross-sectional area of the wire. Since the cross-sectional area of the wire remains constant, the only way to increase current density is to increase the current, which in turn requires an increase in potential difference.

Decreasing the potential difference between the two ends of the wire (option a) would result in a decrease in current density. Similarly, decreasing the magnitude of the electric field in the wire (option c) would also result in a decrease in current density, as electric field is directly proportional to potential difference. Heating the wire to a higher temperature (option d) may increase the resistance of the wire, which would in turn decrease the current and current density.

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The system Zm (or Z/mZ) represents the set of integers modulo m, which can be written as {0, 1, ..., m-1}. Addition (a⊕b) and multiplication (a⊗b) in Zm are defined by finding elements c and d such that a+b-c and ab-d are integer multiples of m, respectively.

To perform addition (a⊕b) in Zm:
1. Add the elements a and b.
2. If the sum is less than m, the result is the sum.
3. If the sum is greater than or equal to m, subtract m from the sum.

To perform multiplication (a⊗b) in Zm:
1. Multiply the elements a and b.
2. Divide the product by m and find the remainder.
3. The remainder is the result of the multiplication in Zm.

These operations enable us to work with integers in a modular system, simplifying arithmetic and allowing for various applications in number theory, cryptography, and computer science.

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The magnetic field inside a solenoid is a magnetic field that is generated by a coil of wire with multiple closely spaced loops, through which an electric current flows. The magnetic field inside a solenoid is typically strong and uniform along the axis of the solenoid, and it is directed along the same axis in the form of concentric circles around the inside of the coil. The strength of the magnetic field inside a solenoid depends on various factors such as the number of turns in the coil, the current flowing through the coil, and the dimensions of the solenoid. Solenoids are commonly used in electromagnets, motors, and other devices that require a controlled magnetic field for their operation.

The formula to calculate the magnetic field inside a solenoid is:
B = (μ₀ * n * I) / L
Here, B is the magnetic field, μ₀ is the permeability of free space (constant value), n is the number of turns per unit length (turns/cm), I is current, and L is the length of the solenoid.

We can rearrange this formula to solve for n:
n = (B * L) / (μ₀ * I)

Putting in the values given in the question, we get:
n = (0.25 T * 50 cm) / (4π * 10^-7 T m/A * 20 A)
n = 5,000 turns/cm

Since we want the total number of turns, we need to multiply by the length of the solenoid in cm:
n_total = 5,000 turns/cm * 50 cm
n_total = 250,000 turns

Therefore, the answer is b. 5,000 turns.

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If a 38.0-turn, 5.70-cm-long solenoid generates a magnetic field with a magnitude of 2.20 mt at its center, the current in the solenoid is 0.726 A.

The magnetic field of a solenoid is calculated as follows:

B = μ₀ * n * I,

The answer to the question is that L = 5.70 cm, B = 2.20 m, and T = 2.20 T, N, and turns equal 38.0. As a result, after plugging these values into the formula above, we get:

4.20 x T*m/A * (38.0 / 0.0570 m) * 2.20 x T

With the data above, we can now determine the current as follows:

I = (2.20 x T) / [(4 x T*m/A) * (38.0 / 0.0570 m)] = 0.726 A

As a result, 0.726 A of current is flowing through the solenoid.

A solenoid is made out of a large coil of wire with several turns. When a current passes through it, it creates an almost homogeneous internal magnetic field. Because they can convert electrical current into mechanical action, solenoids are widely used as switches.

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The smallest value of T for loose rocks on the asteroid's equator to fly off is about 2.2 hours.

To find the smallest value of T for loose rocks on the asteroid's equator to fly off, we need to consider the centrifugal force acting on the rocks due to the rotation of the asteroid. The centrifugal force is given by:

F = m * ω^2 * r

where m is the mass of the rock, ω is the angular velocity of the asteroid, and r is the distance from the center of the asteroid to the rock (which is equal to the radius of the asteroid, r = 18 km).

At the equator of the asteroid, the centrifugal force is balanced by the gravitational force, so we have:

F = m * ω^2 * r = m * g

where g is the acceleration due to gravity on the surface of the asteroid, which we found in part (a): g = 1.66 x 10^-3 m/s^2.

Solving for ω, we get:

ω = sqrt(g/r)

The rotational period T is related to the angular velocity by:

ω = 2π/T

So we can write:

T = 2π/ω = 2π/sqrt(g/r)

Substituting the values, we get:

T = 2π/sqrt(1.66 x 10^-3 m/s^2 * 18,000 m) ≈ 2.2 hours

Therefore, the smallest value of T for loose rocks on the asteroid's equator to fly off is about 2.2 hours.

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The x-component of the electric field at (x=0,y=0,z=0) at t=0 cannot be determined without additional information.

In order to determine the x-component of the electric field at (x=0,y=0,z=0) at t=0, we would need more information about the electromagnetic wave.

The electric and magnetic fields are perpendicular to each other and both are perpendicular to the direction of wave propagation.

Therefore, we would need to know the direction of propagation in order to determine the orientation of the electric and magnetic fields.

Without this information, it is impossible to determine the x-component of the electric field at a specific point in space and time.

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Memory impairments observed in amnesic individuals are MOST commonly observed in the domain of declarative memory. This is because declarative memory involves the conscious recollection of facts and events, which is often affected in cases of amnesia. So the correct option is D.

Declarative memory is a type of long-term memory that involves the conscious recall of factual information, such as events, names, and facts. This type of memory is also referred to as explicit memory because it involves the conscious and intentional retrieval of information. Amnesic individuals typically have difficulty with declarative memory tasks, such as recalling specific events or facts. They may also have difficulty learning and retaining new information.

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To determine the net force acting on the system of particles at t = 2.0 s, we need to differentiate the momentum function with respect to time:

d p/dt = m(dv/dt)

where p is momentum, m is the total mass of the system, and v is velocity.

Differentiating the given momentum function, we get:

d p/dt = 0.71 + 2.4t

At t = 2.0 s, we can substitute t into the above equation to find the rate of change of momentum at that instant:

d p/dt = 0.71 + 2.4(2.0) = 4.31 kg ·m/s

Since force is defined as the rate of change of momentum, we can calculate the net force acting on the system at t = 2.0 s as:

F = d p/dt = 4.31 kg ·m/s

Therefore, the net force acting on the system of particles at t = 2.0 s is 4.31 kg ·m/s.

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According to the given question, a force of 8 N is applied at an angle of 150 degrees with respect to the displacement of a 12 kg box. This means that the force is not being applied in the same direction as the displacement of the box.

In order to calculate the work done, we need to first determine the component of the force in the direction of the displacement. To do this, we can use trigonometry to find the cosine of the angle between the force vector and the displacement vector.

Once we have this value, we can multiply it by the magnitude of the force and the distance traveled to get the work done. It is important to note that work is a scalar quantity and is measured in joules.

Therefore, the final answer will be in joules. In this case, the work done will be less than if the force was applied in the same direction as the displacement.

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The passband gain for the given first-order circuit is 5, and the cutoff frequency is 15,000 rad/s.

To find the passband gain and cutoff frequency of the voltage transfer function T(s) = 5s/(s + 15,000), follow these steps:

1. Passband gain: In a first-order circuit, the passband gain is simply the coefficient of 's' in the numerator, which is 5 in this case.
2. Cutoff frequency: The cutoff frequency is the value of 's' when the denominator is equal to the numerator. In this case, set 5s = s + 15,000, which gives s = 15,000 rad/s as the cutoff frequency.

To plot the Bode gain response using MATLAB, use the following code:

```MATLAB
numerator = [5 0];
denominator = [1 15000];
sys = tff(numerator, denominator);
bode(sys);
```


This code creates a transfer function object 'sys' with the given numerator and denominator coefficients, then uses the 'bode()' function to plot the Bode gain response.

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Yes, there is an advantage to following through when hitting a baseball with a bat, as it helps to maintain a longer contact between the bat and the ball.

When a batter follows through after making contact with the ball, they are able to transfer more energy from the bat to the ball, which can result in a harder hit and greater distance. Additionally, following through helps the batter to maintain their balance and control their swing, which can improve their overall accuracy and consistency. Overall, following through is an important aspect of successful baseball hitting technique.

Following through allows for better control, more power, and higher accuracy when striking the ball. By maintaining a longer contact between the bat and the ball, you're able to transfer more energy to the ball, resulting in a faster and farther hit. Additionally, it helps in maintaining proper body mechanics during the swing, reducing the risk of injury.

In summary, following through when hitting a baseball with a bat provides benefits such as better control, increased power, and improved accuracy, while also reducing the risk of injury.

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The inside of the sun is hotter than the surface of the sun.

The sun's core, where nuclear fusion occurs, has a temperature of approximately 15 million degrees Celsius, while the surface, known as the photosphere, is around 5,500 degrees Celsius. The significant difference in temperature is due to the energy generation process at the core, which involves the fusion of hydrogen atoms to form helium. This process releases a tremendous amount of heat and light, causing the core to be significantly hotter than the surface.

As we move outwards from the core, the temperature decreases gradually through the radiative and convective zones. The radiative zone is where energy moves through radiation, while the convective zone involves the movement of heat through convection currents. The cooler, less dense plasma rises to the photosphere and then sinks back down as it cools, creating a continuous cycle.

In summary, the inside of the sun is hotter than its surface due to the nuclear fusion process occurring at the core. The temperature decreases as we move outward from the core through the radiative and convective zones, eventually reaching the surface, which is cooler and denser in comparison.

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Race as a socio-historical construct, highlights the importance of understanding the social, political, and economic contexts in which race is created and maintained.

According to Michael Omi and Howard Winant, in "Racial Formations," race is a socio-historical concept that is constructed through the intersection of cultural, political, and economic forces.

In this book, they argue that race is not an immutable, biologically determined characteristic of individuals or groups but rather a social construct that is created and maintained through systems of power and inequality. The authors illustrate how race is constructed through examples from different historical periods and social contexts.

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The first partial derivatives of the function W = sin(alpha)cos(beta) are:
∂W/∂α = cos(alpha)cos(beta)
∂W/∂β = -sin(alpha)sin(beta)

To find the first partial derivatives of the function W = sin(alpha)cos(beta), we'll calculate the partial derivative with respect to alpha and the partial derivative with respect to beta.

1. Partial derivative with respect to alpha:
∂W/∂α = ∂(sin(alpha)cos(beta))/∂α
To find this partial derivative, we treat beta as a constant and differentiate the function with respect to alpha. Using the chain rule, we have:
∂W/∂α = cos(alpha)cos(beta)

2. Partial derivative with respect to beta:
∂W/∂β = ∂(sin(alpha)cos(beta))/∂β
To find this partial derivative, we treat alpha as a constant and differentiate the function with respect to beta. Using the chain rule, we have:
∂W/∂β = -sin(alpha)sin(beta)

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In activity 1-1, the direction of the incident ray will be determined by the position of the laser and the glass rod. The laser will emit a beam of light that will be spread out vertically by the glass rod.

This beam will then enter the chamber at a certain angle, which will determine the direction of the incident ray. The incident ray is the path taken by the beam of light as it enters the chamber and interacts with the surfaces inside. The angle at which the beam enters the chamber will determine how it interacts with the surfaces and how it is reflected or refracted. Therefore, the position of the laser and the glass rod will determine the direction of the incident ray in activity 1-1.

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a) To solve the problem for n = 5, we can start by turning off light 5. Then, we turn off light 4 by turning on light 5 (since it was the only light on) and then turning off light 4. We repeat this process for lights 3 and 2, until all the lights are off. Therefore, it takes 4 moves to turn all the lights off for n = 5.

b) To find the number of moves required to turn all n lights off for any n, we can use a recurrence relation. Let M(n) be the number of moves required to turn off n lights.

If we consider the last light, light n, it can only be turned off if all the preceding lights (1 through n-1) are off. This means that we need to turn off all n-1 lights before we can turn off light n.

Once we turn off all n-1 lights, we can turn off light n with one move. Therefore, the total number of moves required to turn off all n lights is M(n-1) + 1.

Using this recurrence relation, we can find the number of moves required for any value of n. For example, for n = 5, we can calculate:

M(5) = M(4) + 1
M(4) = M(3) + 1
M(3) = M(2) + 1
M(2) = M(1) + 1
M(1) = 1

Substituting these values, we get:

M(2) = 2
M(3) = 3
M(4) = 4
M(5) = 5

Therefore, the number of moves required to turn off all 5 lights is 5, which matches the answer we found earlier.

In general, the recurrence relation for the number of moves required to turn off n lights is:

M(n) = M(n-1) + 1, with initial condition M(1) = 1.

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This is the differential equation describing the center of mass position of the spring x(t) for an aging undamped spring with a varying spring constant m([tex]\frac{d^{2}x }{dt^{2} }[/tex]  ) = -k0e(-αt)x(t) + mg .

To find the differential equation describing the center of mass position of the spring x(t), we need to use Newton's second law, which states that the net force acting on an object is equal to its mass times its acceleration. In this case, the object is the spring, and its mass is given by m.
The force acting on the spring is the sum of the forces due to the spring's deformation and its gravitational force. The force due to the spring's deformation is proportional to the displacement of the spring from its equilibrium position, and is given by F = -kx(t), where k is the spring constant at time t. The gravitational force is given by Fg = mg, where g is the acceleration due to gravity.
Therefore, the net force acting on the spring is given by:
Fnet = -kx(t) + mg
Using Newton's second law, we can write:
m([tex]\frac{d^{2}x }{dt^{2} }[/tex]) = -kx(t) + mg
Substituting the expression for k(t) given in the question, we get:
m([tex]\frac{d^{2}x }{dt^{2} }[/tex]²) = -k0e(-αt)x(t) + mg.

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The probability that z is less than -1.54 or greater than 1.89 is 0.1824, or approximately 18.24%.

Using a standard normal distribution table, we can find the probabilities as follows:

P(z < -1.54) = 0.0618

P(z > 1.89) = 0.0294

To find the probability that z is less than -1.54 or greater than 1.89, we add the two probabilities and subtract the overlap:

P(z < -1.54 or z > 1.89) = P(z < -1.54) + P(z > 1.89) - P(-1.54 < z < 1.89)

P(z < -1.54 or z > 1.89) = 0.0618 + 0.0294 - P(-1.54 < z < 1.89)

To find the overlap probability, we can use the complement rule and subtract the probability of z being outside the range from 1:

P(-1.54 < z < 1.89) = 1 - P(z < -1.54 or z > 1.89)

P(-1.54 < z < 1.89) = 1 - (0.0618 + 0.0294)

P(-1.54 < z < 1.89) = 0.9088

Substituting this into the previous equation, we get:

P(z < -1.54 or z > 1.89) = 0.0618 + 0.0294 - 0.9088

P(z < -1.54 or z > 1.89) = 0.1824

The standard normal distribution, also known as the Gaussian distribution, is a probability distribution that is commonly used in physics to describe the behavior of random variables. It is a continuous probability distribution with a bell-shaped curve that is symmetric around the mean. The mean of the distribution is zero, and the standard deviation is one.

The standard normal distribution is particularly useful in physics because it is mathematically tractable and can be used to model a wide variety of physical phenomena. For example, it can be used to describe the distribution of velocities of gas molecules in a gas or the distribution of errors in a measurement experiment. In addition, many physical processes follow the normal distribution or can be approximated by it using the central limit theorem.

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The resulting graph should show a downward slope from the peak to the energy level of the products, indicating the release of energy during the exothermic reaction.

To draw the reaction profile of an exothermic reaction, follow these steps:

Draw a horizontal line to represent the energy of the reactants.

Draw a peak at the transition state to show the energy required to reach the activated complex.

Draw a downward slope to represent the release of energy during the reaction.

Draw a horizontal line at the energy level of the products.

Label the axes of the graph with energy on the y-axis and the reaction coordinate (or progress of the reaction) on the x-axis.

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Refer to the attached image.

The acceleration due to gravity on the planet Htrae is twice the acceleration due to gravity on Earth. Since g(Earth) is approximately 9.8 m/s^2, we have:
g(Htrae) = 2 * 9.8 m/s^2 = 19.6 m/s^2

So the answer is D. 20 m/s^2 (rounded to one significant figure).

The weight of an object is given by the formula:

W = m * g,

where W is weight, m is mass, and g is acceleration due to gravity.

Let's use the given information to solve for the acceleration due to gravity on Htrae. We know that:

Weight on Earth = 450 N
Weight on Htrae = 900 N

We also know that the mass of the object is the same on both planets. Therefore, we can set up the following equation:

m * g(Htrae) = 900 N

Solving for g(Htrae), we get:

g(Htrae) = 900 N / m

To find the value of m, we need to use the weight on Earth. We know that:

W(Earth) = m * g(Earth) = 450 N

Solving for m, we get:

m = 450 N / g(Earth)

Substituting this value of m into the equation for g(Htrae), we get:

g(Htrae) = 900 N / (450 N / g(Earth)) = 2 * g(Earth)

Therefore, the acceleration due to gravity on the planet Htrae is twice the acceleration due to gravity on Earth. Since g(Earth) is approximately 9.8 m/s^2, we have:

g(Htrae) = 2 * 9.8 m/s^2 = 19.6 m/s^2

So the answer is D. 20 m/s^2 (rounded to one significant figure).

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The density of the material is 2.3 × [tex]10^3[/tex] kg/m³.

Mass = (2.0 × [tex]10^{-26}[/tex] kg/molecule) × (2.3 ×[tex]10^{29}[/tex] molecules) = 4.6 × [tex]10^3[/tex] kg

The volume of the material is given as 2.0 [tex]m^3[/tex]. Now we can calculate the density:

density = mass / volume = 4.6 ×[tex]10^3[/tex] kg / 2.0 [tex]m^3[/tex] = 2.3 × [tex]10^3[/tex]kg/[tex]m^3[/tex]

Density is a physical quantity that represents the amount of mass per unit volume of a substance. It is typically denoted by the Greek letter ρ (rho) and has units of kilograms per cubic meter (kg/m³) in the SI system of units. Density is a fundamental concept in physics that helps us understand the behavior of matter

The density of a substance can be calculated by dividing its mass by its volume. It is an important property in many areas of physics, such as materials science, fluid mechanics, and thermodynamics, because it is closely related to the substance's behavior under different conditions. For example, in fluid mechanics, density is a key parameter in determining the buoyancy of an object in a fluid.

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The dose in a thin LiF dosimeter struck by a fluence of 3*10^11 e/cm^2 with t0=20 MeV is 0.00796 Gy.
To determine the dose (Gy) in a thin LiF dosimeter struck by a fluence of 3*10^11 e/cm² with an initial energy (T0) of 20 MeV, you would need to know the energy deposition per unit mass (in J/kg or Gray) and the mass of the dosimeter.

Here's a brief explanation of the terms:

- Dose: It is the energy absorbed per unit mass, measured in Gray (Gy). In this context, it refers to the energy absorbed by the dosimeter from the fluence of particles.

- Dosimeter: A device that measures the absorbed dose of ionizing radiation. In your case, it's a thin LiF dosimeter.

- Fluence: The number of particles (such as electrons) incident on a specific area per unit area, measured in particles/cm². In your example, it is 3*10^11 e/cm².

To find the dose (Gy), you would need more information about the energy deposition per unit mass and the mass of the dosimeter.

To calculate the dose in a thin lif dosimeter struck by a fluence of 3*10^11 e/cm^2 with t0=20 mev, we need to use the following formula:

Dose (Gy) = Fluence (electrons/cm^2) * Conversion Factor * Energy Deposition Coefficient

The conversion factor for electrons in the air is 0.876 Gy/electron/cm^2, and the energy deposition coefficient for lithium fluoride (LiF) is 1.21 eV/electron. Therefore:

Dose (Gy) = 3*10^11 e/cm^2 * 0.876 Gy/electron/cm^2 * (20 MeV * 1.6*10^-19 J/electron) / (1.21 eV/electron * 1000 J/Gy)

Simplifying the units, we get:

Dose (Gy) = 3*10^11 * 0.876 * 20 * 1.6*10^-19 / 1.21 / 1000
Dose (Gy) = 0.00796 Gy

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The turbine from rest to 180 rad/s in 27 s

The inlet, gas turbine engine, which consists of a compressor, combustion chamber, and turbine, and exhaust nozzle are the individual parts of a turbojet engine. Through the inlet, air is taken into the engine, where it is heated and compressed by the compressor.

τ_avg = ΔL / Δt

where ΔL is the change in angular momentum, which can be calculated using:

ΔL = Iω - I(0)

where I(0) is the initial moment of inertia, which we can assume to be zero.

Substituting the given values, we get:

ΔL = Iω = (1/2)Iω² = (1/2) * (180 rad/s)² * I

τ_avg = ΔL / Δt = (1/2) * (180 rad/s)² * I / 27 s

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Yes, there is a change in the momentum of the bal bouncings off a wall so that its velocity coming back has the same magnitude it had prior to bouncing.  Option b Yes, there is an impulse acting on the ball during its collision with the wall.

a. Yes, there is a change in the momentum of the ball. Momentum is a vector quantity that depends on both mass and velocity. Although the magnitude of the velocity is the same before and after the collision, the direction has changed (the ball is moving away from the wall after bouncing). This change in direction results in a change in the momentum of the ball.

b. Yes, there is an impulse acting on the ball during its collision with the wall. Impulse is the change in momentum and is equal to the force acting on the object multiplied by the time the force is applied. Since there is a change in momentum as the ball bounces off the wall, a force must have acted on the ball during the collision, resulting in an impulse.

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To maintain the same magnetic field in a solenoid when the number of turns is cut in half, the current will need to be:
a. Twice

The magnetic field (B) inside a solenoid is given by the formula B = μ₀ × n × I, where μ₀ is the permeability of free space, n is the number of turns per unit length, and I is the current flowing through the solenoid.
When the number of turns is halved, n becomes n/2. To maintain the same magnetic field (B), we need to find the new current I':
B = μ₀ × (n/2) ×I'
Since we want to maintain the same magnetic field, we have:
μ₀ × n × I = μ₀ × (n/2) × I'
Dividing both sides by μ₀ and n, we get:
I = (1/2) × I'
Therefore, to maintain the same magnetic field, the new current I' must be twice the original current:
I' = 2 ×I

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The amount of force being exerted to each wheel when the 4-wheel truck with a total mass of 4000 kg tries to stop is 15,000 N.

First, we'll find the acceleration (a) using the formula:
vf = vi + (a * t)

Rearranging for acceleration, we get:
a = (vf - vi) / t

Substituting the values:
a = (0 - 30) / 2 = -15 m/s²

Now, we'll find the total force (F) using the formula:
F = m * a

Substituting the values:
F = 4000 * -15 = -60,000 N (the negative sign indicates the force is acting in the opposite direction of the initial motion)

Finally, we'll find the force exerted on each wheel by dividing the total force by the number of wheels:
Force per wheel = F / 4 = -60,000 / 4 = -15,000 N

The negative sign indicates that the force is in the opposite direction of the initial velocity (i.e. the force is acting to slow the wheel down). So, each wheel is exerting a force of 15,000 N to stop the truck in 2 seconds.

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